Effect of sub-pressure technique on the bond strength of high-translucent zirconia ceramics to resin cement
Objective To investigate the effect of sub-pressure technique on the bond strength of high-translucent zirconia ceramics with resin cement.Methods Thirty-six polished high-translucent zirconia specimens were randomly divided into four groups(n=9):control group(C)without surface treatment;sandblasting group(SB),50 μm A12O3 uniformly blasted for 20 s;sub-pressure group(SU),specimens coated with treatment agent and then treated with 0.04 MPa sub-pressure;sandblasting+sub-pressure group(SSU),sandblasted specimens coated with treatment agent and then treated with sub-pressure.One specimen of each group was randomly selected for scanning electron microscopy(SEM)for surface observation,and the rest of the specimens were applied to the universal mechanical testing machine for shear strength testing and fracture mode observation under the body microscope,and the results were statistically analyzed.Results The SEM results showed that the high-translucent zirconia bonding surface was significantly changed in the sandblasted group,and there was no difference between the sub-pressure group and the control group,and the surface adhesive was better distributed on the specimens after sub-pressure treatment.The shear bonding adhesive strength of SB(18.54±0.88)and SSU(20.74±2.00)groups treated with sandblasting was significantly higher(P＜0.05)than that of the non-sandblasted C(13.52±0.56)SU group,and the shear bonding adhesive strength of SSU group was significantly greater than that of SB group,and it was statistically significant(P＜0.05),except for SSU group had the most mixed damage.Conclusion Sandblasting treatment can effectively improve the bond strength between high-translucent zirconia and resin bonding agent,the use of sub-pressure technique alone cannot improve the bonding effect,the combined use with sandblasting can significantly improve the bond strength.
Sub-pressureHigh-translucent zirconiaShear bond strength
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